Fix for KT-5937: Receiver of javaClass-property hasn't been generated

  #KT-5937 Fixed
Fix for KT-5495: Support method implementations in local traits

 #KT-5495 Fixed
Fix for KT-5467: JVM codegen doesn't support capture of many extension receivers

  #KT-5467 Fixed
Obsolete KT-3285: "A receiver of type ... is required" when using extension functions

  #KT-5467 Obsolete
Obsolete KT-1776: Can't resolve members of auto-casted "this" in extension without typing "this" explicitly

  #KT-1776 Obsolete